<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .test {
            width: 100px;
            height: 100px;
            background-color: red;
        }
    </style>
</head>
<body>


<div class="test" style="width:200px;"></div>
<div class="test" style="width:200px;"></div>
<div class="test" style="width:200px;"></div>

<script src="jquery-3.4.1.js"></script>
<script >
    const $dom = $('.test');
    $dom.get(0).length = 3;
    console.log($dom[0].length);
    console.log($dom.width());
    console.log($dom.get(0));
    console.log($dom.get(0).offsetWidth);
</script>


</body>
</html>